A developer wrote Apex code that calls out to an external system. How should a developer write the test to provide test coverage?

A Salesforce Administrator is creating a record-triggered flow. When certain criteria are met, the flow must call an Apex method to execute complex validation involving several types of objects.
When creating the Apex method, which annotation should a developer use to ensure the method Can be used within the flow?

The following code snippet is executed by a Lightning web component in an environment with more than 2,000 lead records:

Which governor limit will likely be exceeded within the Apex transaction?

How can a developer check the test coverage of active Process Builder and Flows deploying them in a Changing Set?

Which statement generates a list of Leads and Contacts that have a field with the phrase 'ACME'?